package com.undead.gulimall.product.service.impl;

import com.undead.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.undead.common.utils.PageUtils;
import com.undead.common.utils.Query;

import com.undead.gulimall.product.dao.CategoryDao;
import com.undead.gulimall.product.entity.CategoryEntity;
import com.undead.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
//    @Autowired
//    private StringRedisTemplate redisTemplate;
//
//    @Autowired
//    RedissonClient redisson;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> entities= baseMapper.selectList(null);
        List<CategoryEntity> level1Meuns=entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            //2. 菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return entities;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前删除的菜单 是否别的的地方引用

        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths=new ArrayList<>();
        List<Long> parentPath= findParentPath(catelogId,paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
//        return new Long[0];
    }


    private List<Long>  findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId=this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;

    }



    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
//            return categoryEntity.getParentCid().longValue() == root.getCatId().longValue();  // 注意此处应该用longValue()来比较，否则会出先bug，因为parentCid和catId是long类型
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            // 1.找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            //2. 菜单的排序
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }
    //级联更新所有关联的数据库
    @Transactional
    @Override
    public void updateCasecade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
//        this.baseMapper.updateCategory(catId,name);
//
    }

//    @CacheEvict(value = "category",allEntries = true)  // 失效模式
//    @CachePut // 双写模式
//    @Transactional
//    @Override
//    public void updateCasecade(CategoryEntity category) {
//        this.updateById(category);
//        categoryBrandRelationService.updateCategory(category.getCatId(), category.getName());
//    }


}